<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseenter="itemWrapEnter" @mouseleave="itemWrapLeave">
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
          <div class="sort"  v-show="showSort">
            <div class="all-sort-list2" @click="toSearch">
              <!--一节分类 -->
              <div class="item"
                   :class="{itemHover:currenIndex===index}"
                   @mouseenter="itemEnter(index)"
                   v-for="(c1,index) in CategoryList" :key="c1.categoryId">
                <h3>
                  <!--一节分类 -->
                  <a href="javascript:;" :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
                  <!--                    <a href="javascript:;" @click="toSearch({categoryName:c1.categoryName,category1Id:c1.categoryId})">{{c1.categoryName}}</a>-->
                  <!--                <router-link :to="`/Search?categoryName=${c1.categoryName}&categoryId=${c1.categoryId}`">{{c1.categoryName}}</router-link>-->
                </h3>
                <div class="item-list clearfix">
                  <div class="subitem">
                    <!--二级分类 -->
                    <dl class="fore" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                      <dt>
                        <!--二级分类 -->
                        <a href="javascript:;" :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                        <!--                      <a href="javascript:;" @click="toSearch({categoryName:c2.categoryName,category2Id:c2.categoryId})">{{c2.categoryName}}</a>-->
                        <!-- <router-link :to="`/Search?categoryName=${c2.categoryName}&categoryId=${c2.categoryId}`">{{c2.categoryName}}</router-link>-->
                      </dt>
                      <dd>
                        <!--三级分类 -->
                        <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                          <a href="javascript:;" :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a>
                          <!--                        <a href="javascript:;" @click="toSearch({categoryName:c3.categoryName,category3Id:c3.categoryId})">{{c3.categoryName}}</a>-->
                          <!-- <router-link :to="`/Search?categoryName=${c3.categoryName}&categoryId=${c3.categoryId}`">{{c3.categoryName}}</router-link>-->
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import {mapState} from "vuex"
import throttle from "lodash/throttle.js"
export default {
  name: "TypeNav",
  data(){
    return {
      //代表当前展开的一级分类的下标
      //-2代表处于一级分类的外部
      //-1代表处于一级分类上
      //其他大于o，选中一个一级分类了
        currenIndex:-2,
        //控制一级列表的显示隐藏
      showSort:["/","/Home"].includes(this.$route.path)
    }
  },
  computed:{
    ...mapState({
        CategoryList:state=> state.home.CategoryList,
      searchVal:state=> state.searchVal
    })
  },
  methods:{
    //代表移除一级分类区域
    itemWrapLeave(){
      this.currenIndex=-2;
      //除了home组件隐藏一级分类
      if (!["/","/Home"].includes(this.$route.path)){
        this.showSort=false
      }
    },
    //代表进入一级分类区域
    itemWrapEnter(){
        this.currenIndex=-1;
        //显示一级分类
        this.showSort=true
    },
    //让一级分类下的二三级分类显示出来
    itemEnter:throttle(function (index){
      //只有鼠标在一级分类上 才允许它改变
      if(this.currenIndex !==-2){
        this.currenIndex=index
      }
    },200),
    //三级分类跳转到Search组件
    toSearch(event){
      let localtion = {name:"Search"}
      //如果之前点击过搜索按钮
      const {keyword} = this.$route.params;
      //用编程式路由进行跳转
      const {categoryname,category1id,category2id,category3id}=event.target.dataset
      let query ={categoryName:categoryname};
      category1id ? query.category1Id=category1id : ""
      category2id ? query.category2Id=category2id : ""
      category3id  ? query.category3Id=category3id : ""

      keyword ? localtion.params = {keyword} :"";
      query ? localtion.query = query :"";


      //如果不是serach   跳 serach组件应该使用push
      //如果是serach 跳 serach组件应该使用replace
      if(this.$route.path.toLowerCase().startsWith("/search")){
        this.$router.replace(localtion)
      }else{
        this.$router.push(localtion)
      }
        //隐藏三级列表
        this.itemWrapLeave()
    }
  }
}
</script>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &.itemHover {
            background-color: #e1251b;
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}

</style>
